I have this problem, and Only way to deal with it is to be ruthless.
School books and university notes, straight into rubbish sacks, don't bother looking at them. If you don't want them going to the tip, Google a local shredding service.
Cds and dvds and books either straight to a charity shop, or get your children/young people to price them up for cex/music magpie, letting them keep the proceeds.
Clothes straight to a charity shop, don't bother sorting, you haven't seen them for years, you don't need them.
Furniture, broken or outdated appliances technology, household items etc, local tip. Unlikely you are throwing away any valuable gems.
Get everything out of the house as quickly as possible, don't bother with car boot sales or ebay, that will give you time to change your mind, and you will have crap hanging around the house instead of in the loft.
The money they cost is gone, you can't get it back.